|Publication number||US5656950 A|
|Application number||US 08/548,791|
|Publication date||Aug 12, 1997|
|Filing date||Oct 26, 1995|
|Priority date||Oct 26, 1995|
|Publication number||08548791, 548791, US 5656950 A, US 5656950A, US-A-5656950, US5656950 A, US5656950A|
|Inventors||Khue Duong, Stephen M. Trimberger|
|Original Assignee||Xilinx, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (7), Referenced by (115), Classifications (11), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention pertains to a flexible and fast interconnect scheme for routing signals within a field programmable gate array.
Integrated circuit (IC) semiconductor chips are the critical components found in virtually all modern telecommunications, computer, and electronics products. Many of these semiconductor chips are custom-made and tailored to the exact specifications supplied by the designers. However, these dedicated custom chips can be quite expensive to produce. Hence, they are not ideally suited for those instances where only a limited quantity of chips are desired. Furthermore, it can take quite a long time to fabricate these custom chips. In today's competitive environment, time-to-market is of utmost importance. Crucial market share might be irretrievably lost while a company waits for its custom chips to be produced and delivered. And if there is an error somewhere in the initial design or layout, more delays are incurred in fixing the problems.
In response to the shortcomings inherent to custom IC chips, field-programmable gate arrays (FPGAs) were developed. An FPGA is a standard off-the-shelf semiconductor chip that can be individually programmed to perform the desired functions. An FPGA can be reprogrammed an unlimited number of times and can be used in innovative designs where hardware is changed dynamically, or where hardware must be adapted to different user applications. An FPGA is typically comprised of three major configurable elements: configurable logic blocks (CLBs), input/output blocks (IOBs), and interconnect lines. The CLBs provide the functional elements for constructing the desired logic. The IOBs provide the interface between the package pins and internal signal lines. Finally, the interconnect lines provide routing paths to connect the input and output terminals of the CLBs and IOBs onto the appropriate networks. The desired circuit design is established by programming internal static memory cells to control the logic functions and interconnections that are used to produce the desired results.
Typically, there are three main types of interconnect lines, which are distinguished by the relative length of their segments: single-length lines, double-length lines, and long lines. The single-length lines are comprised of a grid of horizontal and vertical metal lines that intersect at a switch matrix between each CLB. The switch matrix, which includes a plurality of programmable transistors, establishes connections between the single-length lines. The double-length lines consist of a grid of metal segments that are twice as long as the single-length lines. Hence, a double-length line runs past two CLBs before entering a switch matrix. Long lines form a grid of metal interconnect segments that run the entire length or width of an array.
FIG. 1 illustrates a prior art FPGA 101 which includes CLBs 102-117, decoders 118-121, IOBs 122-125, and long lines 126-131. Each of the long lines 126-131 has a programmable splitter switch positioned approximately at its center. These splitter switches 132-137 enable the long lines 126-131 to be separated into two independent routing channels, each of which runs half the width or height of the array. For example, splitter switch 134 can be closed so that the segments 138 is electrically connected to segment 139. Hence, a signal originating from CLB 104 can be routed by long line 129 to CLB 116. Alternatively, splitter switch 134 can be in an open position so that the two segments 138 and 139 are separate, thereby allowing segment 138 to conduct signals between CLB 104 and CLB 108 and segment 139 to conduct signals between CLB 112 and CLB 116. However, one shortcoming associated with FPGA 101 is that a long line can only conduct a maximum of two signals at any given time. Hence, a need arises for a different, more flexible approach that allows more signals to be handled by a long line, and yet retains the capability of a long line to conduct a signal the full width or height of the array.
Another disadvantage of FPGA 101 is that the long lines are often used in part of a critical path. As such, it is essential that the signals on the critical path be routed as quickly as possible to increase the overall speed of the chip. In typical FPGAs, the long lines are made of passive metal conductors, wherein the splitter switches simply connect and disconnect the long line segments. Therefore, a further need arises for a mechanism that actively drives the signals on a long line so as to speed up critical path signals. Moreover, it would be preferable if such a mechanism were hi-directionally buffered so that signals could be actively driven in either direction on a long line.
Buffers are advantageously inserted and used in a conductive line when the effect of the buffer is to increase the speed of signal flow. Short lines are typically connected together by pass transistors or transmission gates which are not buffered because the buffer would slow down the signal flow. In a typical FPGA, a number of horizontal and vertical long interconnect lines spanning the array are used to carry signals from one configurable logic block to another configurable logic block. Connections from one long line to another are typically buffered because the buffer increases the speed of signal flow (the performance).
The present invention pertains to long interconnect lines that can be segmented and buffered for routing signals in a field programmable gate array. The field programmable gate array is comprised of an array of configurable logic blocks that are used to perform pre-programmed logic functions. According to the invention, lines on which speed of signal flow can be increased by buffering have at least one bi-directional buffer interposed therein. The bi-directional buffers are used to selectively separate a long interconnect line into a number of segments and buffer signals placed onto the line. The signals can be driven in either direction by the bi-directional buffers. In one embodiment, the bi-directional buffers are tristated to separate the segments so each segment can be used independent of the others.
The present invention is illustrated by way of example, and not byway of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar elements and in which:
FIG. 1 illustrates a prior art field programmable gate array.
FIG. 2 shows a portion one embodiment of the segmented bi-directionally driven long line interconnect scheme of the present invention.
FIG. 3 shows another embodiment of the present invention in which the long lines are separable into four segments by implementing three bi-directional buffers per vertical and horizontal long line.
FIG. 4 illustrates a circuit diagram of one of a bi-directional buffer as can be used to segment a long line.
FIG. 5 shows a bi-directional, multiple-source buffer circuit, which can be used to buffer and drive the various signals of the present invention.
FIG. 6 is a logical block diagram of the bi-directional, multiple-source buffer circuit illustrating the auxiliary input signal, the auxiliary input signal, the input/output line, and the input/output line.
FIG. 7 shows a typical programmable interconnect point.
The term "long" will be used here to describe any line in which the signal speed can be increased by buffering. Thus the term "long" may refer to lines which are relatively short physically, but are heavily loaded so that buffering increases signal speed. In a location where buffering is determined not to increase speed, a line may be segmented by a simple pass transistor or transmission gate so that the buffer does not slow down the signal.
FIG. 2 shows a portion of one embodiment of a segmented bi-directionally driven "long" line interconnect scheme of the present invention. An FPGA typically has a square CLB matrix (8×8, 10×10, 12×12, 14×14, 16×16, 18×18, 20×20, 24×24, 28×28, 32×32, etc.). Consequently, there may be as few as 64 or as many as 1,024 plus CLBs contained within an FPGA chip. In FIG. 2, only six representative CLBs 201-206 are shown. However, the present invention applies to any CLB matrix size. Moreover, the configuration of a CLB may include one or more elements, such as function generators, flip-flops, buffers, multiplexers, and registers. The present invention also applies equally to any kind of CLB configuration.
Each CLB contains input and output ports. These input/output ports are programmably interconnected by single-length metal lines having programmable switching points and switching matrices. For example, CLB 201 can be locally coupled to surrounding neighbor CLBs via any of the single-length lines 207-214 through switch matrix 215 (the actual lines connecting CLB 201 to the single-length lines not shown). Switch matrix 215 includes programmable n-channel pass transistors used to establish connections between single-length lines 207-214. In some embodiments, double-length lines (twice as long as the single-length lines) (not shown for simplicity) are used to run past two CLBs before they enter a switch matrix. Double-length lines are grouped in pairs with the switch matrices staggered so that each line goes through a switch matrix at every other CLB location in that row or column.
A number of long lines are used to provide routing resources to carry signals at greater distances. Horizontal and vertical long lines typically span the entire width or height of the chip to minimize delay and skew, but of course may span a shorter distance if they can be used to drive many loads or large loads. In FIG. 3, the long lines form a grid of metal interconnect segments that run the height or width of the array and bypass the switch matrices. In one embodiment, vertical long lines, driven by special global buffers, distribute clock signals and other high fanout control signals throughout the array with minimal skew.
In the present invention, at least one long line is broken into two or more segments by implementing a bi-directional buffer. Bidirectional buffer 217 has been located between line segments 218 and 219 because these segments may be sufficiently heavily loaded that bidirectional buffer 217 will speed up signal flow. For example, horizontal long line 216 is capable of being broken into two segments (i.e. two independent routing channels) 218 and 219 by a bi-directional buffer 217. Bi-directional buffer 217 can drive a signal from long line segment 218 to long line segment 219, or from long line segment 219 to segment 218, or can be tristated to separate the two segments. Similarly, a bi-directional buffer 222 selectively drives a signal in either direction or neither direction on line segments 224 and 225.
It should be noted that numerous bi-directional buffers can be implemented to break a horizontal or vertical long line into multiple segments. Pass gates may be interspersed with bidirectional buffers along the same long line for maximum speed. The number of routing channels shown in the figures of this patent are for illustration purposes only. The actual number of routing channels and long lines varies with the array size and chip capacity. For example, FIG. 3 shows one embodiment of the present invention where the long lines are separable into four segments by implementing three bi-directional buffers per vertical or horizontal long line. In the FPGA configuration shown in FIG. 3, an 8×8 array of CLBs 350 is shown. The CLB array is bordered with a number of IOBs 351.
In this embodiment, each interconnection column or row has associated long lines. For example, interconnection column 301 includes three vertical long lines 302-304, whereas interconnection row 305 includes two horizontal long lines 306 and 307. Furthermore, additional horizontal long lines, for example, long lines 309 and 310, are provided adjacent to each row of IOBs 351. Each horizontal long line has three bi-directional buffers (represented by the solid dots). For example, long line 308 has three bi-directional buffers 312-314. Similarly, each of the vertical long lines has three corresponding bi-directional buffers. For example, vertical long line 302 has three bi-directional buffers 315-317 (represented by a circle). The above referenced bi-directional buffers (solid dots or circles) enable the horizontal and vertical long lines to function either as one continuous segment, two independent segments, or four independent segments. For example, bi-directional buffers 312-314 can be programmed such that horizontal long line 308 is broken into four independent segments 326-329. Hence, a first signal can be routed from CLB 350A to CLB 350B via long line segment 326; a second signal can be routed from CLB 350C to CLB 350D via long line segment 327; a third signal can be routed from CLB 350E to CLB 350F via long line segment 328; and a fourth signal can be routed from CLB 350G to CLB 350H via long line segment 329. It should be noted that, in the present invention, additional bi-directional buffers may be used to enable a long line to be broken into more sections. Furthermore, one may choose to use the bi-directional buffers only on a portion of the long lines. For instance, only the outer long lines might have bi-directional buffers. The other long lines can be normal, unbroken long lines.
FIG. 4 illustrates one embodiment of a bi-directional buffer 401 to segment a long line, and provide periodic signal isolation and restoration for improved performance of lengthy signal nets. Bi-directional buffer 401, which is provided on a vertical long line 408, includes four pass transistors 402-405 and a buffer comprising two inverters 406 and 407. If a signal is routed from a top segment 413A of vertical long line 408 to its bottom segment 413B, a high signal (e.g., +5 volts) is applied to node 411 and a low signal (e.g., 0 volts) is applied to node 412. The high signal on the gates of pass transistors 402 and 403 causes them to conduct, whereas the low signal on the gates of pass transistors 404 and 405 causes them to be non-conducting. Hence, the signal starts from segment 413A, passes through transistor 402, is driven by inverters 406 and 407, and passes through transistor 403 to segment 413B. A signal flowing from top to bottom of vertical long line 408 is traced by the solid line 409.
If a signal is routed from segment 413B of vertical long line 408 to segment 413A, a low signal is applied to node 411 and a high signal is applied to node 412. The low signal on the gates of pass transistors 402 and 403 causes them to turn off, whereas the high signal on the gates of pass transistors 404 and 405 causes them to be conducting. Hence, the signal starts from segment 413B, passes through transistor 404, is driven by inverters 406 and 407, and passes through transistor 405 to segment 413A. A signal flowing from bottom to the top segment of vertical long line 408 is traced by the dashed line 410. These and other embodiments of bi-directional buffers are described in detail in U.S. Pat. No. 4,695,740 (issued on Sep. 22, 1987 to Carter), U.S. Pat. No. 4,713,557 (issued on Dec. 15, 1987 to Carter), and U.S. Pat. No. 4,835,418 (issued on May 30, 1989 to Hsieh).
FIG. 5 shows a multi-directional, multiple-source buffer circuit 500, which can be used to buffer and drive the various signals of the present invention. Circuit 500 is described below and also within incorporated U.S. Pat. No. 5,583,452, entitled "Tri-Directional Buffer," by K. Duong and assigned to the assignee of the present invention. The circuit 500 allows a signal over line 584 or over line 560 to be sourced, buffered by circuits 532, 534 and driven over line 550. Multiplexer 580 provides the selection between lines 584 and 560 as the source of the signal. When memory cell 582 is programmed such that multiplexer 580 selects the HL input/output line 560 as input, and memory cell 510 contains a "0" and memory cell 520 contains a "1," then transistor 570b is ON, transistor 572a is ON and transistors 570a and 572b are OFF. This configuration allows a signal entering over line 560 to be buffered by buffer circuits 532 and 534 and output over input/output line 550. The value of memory cell 542 is ignored in this configuration.
FIG. 6 is a logical block diagram of the circuit 500 of FIG. 5 illustrating the auxiliary input signal 552, the auxiliary input signal 584, the input/output line 550, and the input/output line 560. There are a number of well known methods and procedures that can be used within the scope of the present invention to program the memory cells 542, 510, 520, and 582 of circuit 500 to allow selection of either line 552 or line 550 as the source input or to allow selection of either line 584 or line 560 as the source input. Table I below illustrates an exemplary truth table.
TABLE I______________________________________Cell 582 Cell 542 Cell 510 Cell 520 Configuration______________________________________X 0 1 0 Drive from 550 to 560X 1 1 0 Drive from 552 to 5600 X 0 1 Drive from 560 to 5501 X 0 1 Drive from 584 to 550X X 0 0 Open Circuit______________________________________ X = Don't Care
When memory cell 582 of FIG. 5 is programmed such that multiplexer 580 selects the CO input line 584 as input, and memory cell 510 contains a "0" and memory cell 520 contains a "1," then transistor 570b is ON, transistor 572a is ON and transistors 570a and 572b are OFF. This configuration allows a signal entering over line 584 to be buffered by buffer circuits 532 and 534 and output over input/output line 550. The value of memory cell 542 is ignored in this configuration.
When memory cell 510 contains a "1" and memory cell 520 contains a "0," then transistor 570a is ON, transistor 572b is ON and transistors 570b and 572a are OFF. This allows a signal entering over line 550 or line 552 (depending on the state of memory cell 542) to be buffered by buffer circuits 532 and 534 and output over input/output line 560. In this configuration, the state of the memory cell 582 is ignored.
Circuit 500 of FIG. 5 is multi-directional because either input line 584 or input/output line 560 can be sourced, buffered by circuits 532 and 534, and driven over input/output line 550. In this way, an auxiliary signal over line 584 (e.g., a carry out signal) can be buffered by circuit 500. Circuit 500 also allows a signal input over 550 to be buffered by circuits 532 and 534 and output over line 560.
FIG. 7 shows an exemplary programmable interconnect point (PIP) which includes a pass transistor 704 having its gate coupled to a programmable memory cell 705. Memory cell 705 can be programmed to contain information that either turns on or turns off transistor 704. If turned or programmed ON, transistor 704 electrically connects lines 702 and 703. If turned or programmed OFF, transistor 704 does not connect lines 702 and 703.
The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and are not intended to be exhaustive or to limit the invention to the precise forms disclosed. The embodiments were chosen and described to best explain the principles of the invention and its practical application, thereby enabling those skilled in the art to utilize the invention. Many modifications and variations are possible in light of the above teaching. It is intended that the scope of the invention only be defined by the claims appended hereto and their equivalents.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US4642487 *||Sep 26, 1984||Feb 10, 1987||Xilinx, Inc.||Special interconnect for configurable logic array|
|US4695740 *||Sep 26, 1984||Sep 22, 1987||Xilinx, Inc.||Bidirectional buffer amplifier|
|US4713557 *||Feb 11, 1987||Dec 15, 1987||Xilinx, Inc.||Bidirectional buffer amplifier|
|US4835415 *||Feb 22, 1988||May 30, 1989||Standard Elektrik Lorenz Aktiengesellschaft||Circuit for amplifying and shaping an AC signal|
|US5497108 *||Dec 8, 1994||Mar 5, 1996||Dynalogic Corporation||BICMOS repeater circuit for a programmable logic device|
|US5512765 *||Feb 3, 1994||Apr 30, 1996||National Semiconductor Corporation||Extendable circuit architecture|
|USRE34363 *||Jun 24, 1991||Aug 31, 1993||Xilinx, Inc.||Configurable electrical circuit having configurable logic elements and configurable interconnects|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US6037800 *||Mar 16, 1999||Mar 14, 2000||Xilinx, Inc.||Method for programming a programmable gate array having shared signal lines for interconnect and configuration|
|US6160420||Nov 12, 1996||Dec 12, 2000||Actel Corporation||Programmable interconnect architecture|
|US6181160||Jul 28, 1999||Jan 30, 2001||Altera Corporation||Programmable logic device with hierarchical interconnection resources|
|US6225823 *||Mar 24, 2000||May 1, 2001||Altera Corporation||Input/output circuitry for programmable logic devices|
|US6300794||Jan 20, 2000||Oct 9, 2001||Altera Corporation||Programmable logic device with hierarchical interconnection resources|
|US6417694||Sep 19, 2001||Jul 9, 2002||Altera Corporation||Programmable logic device with hierarchical interconnection resources|
|US6424171 *||Oct 28, 1999||Jul 23, 2002||Nec Corporation||Base cell and two-dimensional array of base cells for programmable logic LSI|
|US6487697 *||Mar 28, 2001||Nov 26, 2002||Lsi Logic Corporation||Distribution dependent clustering in buffer insertion of high fanout nets|
|US6577160||Jun 10, 2002||Jun 10, 2003||Altera Corporation||Programmable logic device with hierarchical interconnection resources|
|US6636072 *||Jul 25, 2000||Oct 21, 2003||Koninklijke Philips Electronics N.V.||Bidirectional interface|
|US6798242||Apr 29, 2003||Sep 28, 2004||Altera Corporation||Programmable logic device with hierarchical interconnection resources|
|US6859065 *||Aug 27, 2003||Feb 22, 2005||Altera Corporation||Use of dangling partial lines for interfacing in a PLD|
|US6903570 *||Oct 6, 2003||Jun 7, 2005||Sony Corporation||Bidirectional signal transmission circuit|
|US6989688 *||Apr 21, 2004||Jan 24, 2006||Btr, Inc.||Architecture and interconnect scheme for programmable logic circuits|
|US7078933||Sep 21, 2005||Jul 18, 2006||Btr, Inc.||Architecture and interconnect scheme for programmable logic circuits|
|US7084666 *||Jan 24, 2005||Aug 1, 2006||Viciciv Technology||Programmable interconnect structures|
|US7142012||May 10, 2006||Nov 28, 2006||Btr, Inc.||Architecture and interconnect scheme for programmable logic circuits|
|US7239174||Oct 10, 2006||Jul 3, 2007||Viciciv Technology||Programmable interconnect structures|
|US7292067||May 13, 2005||Nov 6, 2007||Itt Manufacturing Enterprises, Inc.||Method and apparatus for buffering bi-directional open drain signal lines|
|US7321241 *||Jun 15, 2006||Jan 22, 2008||California Micro Devices||Bidirectional buffer with slew rate control and method of bidirectionally transmitting signals with slew rate control|
|US7348803 *||Jun 23, 2006||Mar 25, 2008||Integrated Electronic Solutions Pty. Ltd.||Bi-directional bus buffer|
|US7446562||May 25, 2005||Nov 4, 2008||Nec Corporation||Programmable semiconductor device|
|US7446565||Jun 15, 2006||Nov 4, 2008||California Micro Devices||Apparatus and method that provides active pull-up and logic translation from one signal mode to another signal mode|
|US7514957 *||May 27, 2007||Apr 7, 2009||Tabula, Inc||Configurable IC having a routing fabric with storage elements|
|US7521959||May 27, 2007||Apr 21, 2009||Tabula, Inc.||Configurable IC having a routing fabric with storage elements|
|US7525344||May 27, 2007||Apr 28, 2009||Tabula, Inc.||Configurable IC having a routing fabric with storage elements|
|US7545167||Jan 28, 2008||Jun 9, 2009||Tabula, Inc.||Configurable IC with interconnect circuits that also perform storage operations|
|US7587698||May 21, 2007||Sep 8, 2009||Tabula Inc.||Operational time extension|
|US7679401||Dec 1, 2005||Mar 16, 2010||Tabula, Inc.||User registers implemented with routing circuits in a configurable IC|
|US7782087||Aug 24, 2010||Martin Vorbach||Reconfigurable sequencer structure|
|US7822881||Oct 26, 2010||Martin Vorbach||Process for automatic dynamic reloading of data flow processors (DFPs) and units with two- or three-dimensional programmable cell architectures (FPGAs, DPGAs, and the like)|
|US7822968||Oct 26, 2010||Martin Vorbach||Circuit having a multidimensional structure of configurable cells that include multi-bit-wide inputs and outputs|
|US7840842||Nov 23, 2010||Martin Vorbach||Method for debugging reconfigurable architectures|
|US7844796||Aug 30, 2004||Nov 30, 2010||Martin Vorbach||Data processing device and method|
|US7899962||Mar 1, 2011||Martin Vorbach||I/O and memory bus system for DFPs and units with two- or multi-dimensional programmable cell architectures|
|US7928763||Jul 14, 2010||Apr 19, 2011||Martin Vorbach||Multi-core processing system|
|US7996827||Aug 16, 2002||Aug 9, 2011||Martin Vorbach||Method for the translation of programs for reconfigurable architectures|
|US8058899||Feb 13, 2009||Nov 15, 2011||Martin Vorbach||Logic cell array and bus system|
|US8069373||Jan 15, 2009||Nov 29, 2011||Martin Vorbach||Method for debugging reconfigurable architectures|
|US8093922||Apr 6, 2009||Jan 10, 2012||Tabula, Inc.||Configurable IC having a routing fabric with storage elements|
|US8099618||Jan 17, 2012||Martin Vorbach||Methods and devices for treating and processing data|
|US8127061||Feb 18, 2003||Feb 28, 2012||Martin Vorbach||Bus systems and reconfiguration methods|
|US8145881||Mar 27, 2012||Martin Vorbach||Data processing device and method|
|US8156284||Jul 24, 2003||Apr 10, 2012||Martin Vorbach||Data processing method and device|
|US8156312||Jun 19, 2007||Apr 10, 2012||Martin Vorbach||Processor chip for reconfigurable data processing, for processing numeric and logic operations and including function and interconnection control units|
|US8166435||Apr 24, 2012||Tabula, Inc.||Timing operations in an IC with configurable circuits|
|US8195856||Jun 5, 2012||Martin Vorbach||I/O and memory bus system for DFPS and units with two- or multi-dimensional programmable cell architectures|
|US8209653||Jun 26, 2012||Martin Vorbach||Router|
|US8230411||Jun 13, 2000||Jul 24, 2012||Martin Vorbach||Method for interleaving a program over a plurality of cells|
|US8250503||Jan 17, 2007||Aug 21, 2012||Martin Vorbach||Hardware definition method including determining whether to implement a function as hardware or software|
|US8281108||Jan 20, 2003||Oct 2, 2012||Martin Vorbach||Reconfigurable general purpose processor having time restricted configurations|
|US8281265||Nov 19, 2009||Oct 2, 2012||Martin Vorbach||Method and device for processing data|
|US8281273||Oct 2, 2012||Tabula, Inc.||Method and apparatus for identifying connections between configurable nodes in a configurable integrated circuit|
|US8289047||Oct 16, 2012||Actel Corporation||Architecture and interconnect scheme for programmable logic circuits|
|US8301872||May 4, 2005||Oct 30, 2012||Martin Vorbach||Pipeline configuration protocol and configuration unit communication|
|US8310274||Mar 4, 2011||Nov 13, 2012||Martin Vorbach||Reconfigurable sequencer structure|
|US8312200||Jul 21, 2010||Nov 13, 2012||Martin Vorbach||Processor chip including a plurality of cache elements connected to a plurality of processor cores|
|US8312301||Sep 30, 2009||Nov 13, 2012||Martin Vorbach||Methods and devices for treating and processing data|
|US8350591||Jan 8, 2013||Tabula, Inc.||Configurable IC's with dual carry chains|
|US8407525||Mar 26, 2013||Pact Xpp Technologies Ag||Method for debugging reconfigurable architectures|
|US8429385||Sep 19, 2002||Apr 23, 2013||Martin Vorbach||Device including a field having function cells and information providing cells controlled by the function cells|
|US8468329||Jun 8, 2012||Jun 18, 2013||Martin Vorbach||Pipeline configuration protocol and configuration unit communication|
|US8471593||Nov 4, 2011||Jun 25, 2013||Martin Vorbach||Logic cell array and bus system|
|US8645890||Sep 15, 2012||Feb 4, 2014||Tabula, Inc.||Method and apparatus for identifying connections between configurable nodes in a configurable integrated circuit|
|US8686475||Feb 9, 2011||Apr 1, 2014||Pact Xpp Technologies Ag||Reconfigurable elements|
|US8686549||Sep 30, 2009||Apr 1, 2014||Martin Vorbach||Reconfigurable elements|
|US8723549||Dec 5, 2011||May 13, 2014||Tabula, Inc.||Configurable IC having a routing fabric with storage elements|
|US8726250||Mar 10, 2010||May 13, 2014||Pact Xpp Technologies Ag||Configurable logic integrated circuit having a multidimensional structure of configurable elements|
|US8803552||Sep 25, 2012||Aug 12, 2014||Pact Xpp Technologies Ag||Reconfigurable sequencer structure|
|US8812820||Feb 19, 2009||Aug 19, 2014||Pact Xpp Technologies Ag||Data processing device and method|
|US8819505||Jun 30, 2009||Aug 26, 2014||Pact Xpp Technologies Ag||Data processor having disabled cores|
|US8863067||Feb 6, 2008||Oct 14, 2014||Tabula, Inc.||Sequential delay analysis by placement engines|
|US8869121||Jul 7, 2011||Oct 21, 2014||Pact Xpp Technologies Ag||Method for the translation of programs for reconfigurable architectures|
|US8914590||Sep 30, 2009||Dec 16, 2014||Pact Xpp Technologies Ag||Data processing method and device|
|US8928352||Jan 28, 2014||Jan 6, 2015||Tabula, Inc.||Controllable storage elements for an IC|
|US8941409||Jul 2, 2012||Jan 27, 2015||Tabula, Inc.||Configurable storage elements|
|US9018977||Feb 14, 2014||Apr 28, 2015||Tabula, Inc.||User registers implemented with routing circuits in a configurable IC|
|US9037807||Nov 11, 2010||May 19, 2015||Pact Xpp Technologies Ag||Processor arrangement on a chip including data processing, memory, and interface elements|
|US9047440||May 28, 2013||Jun 2, 2015||Pact Xpp Technologies Ag||Logical cell array and bus system|
|US9075605||Oct 17, 2012||Jul 7, 2015||Pact Xpp Technologies Ag||Methods and devices for treating and processing data|
|US9092595||Nov 17, 2014||Jul 28, 2015||Pact Xpp Technologies Ag||Multiprocessor having associated RAM units|
|US9141390||Sep 29, 2014||Sep 22, 2015||Pact Xpp Technologies Ag||Method of processing data with an array of data processors according to application ID|
|US9148151||Jul 13, 2012||Sep 29, 2015||Altera Corporation||Configurable storage elements|
|US9154134||May 19, 2014||Oct 6, 2015||Altera Corporation||Configurable storage elements|
|US9170812||Dec 16, 2014||Oct 27, 2015||Pact Xpp Technologies Ag||Data processing system having integrated pipelined array data processor|
|US9250908||Jun 27, 2014||Feb 2, 2016||Pact Xpp Technologies Ag||Multi-processor bus and cache interconnection system|
|US9274984||Aug 12, 2014||Mar 1, 2016||Pact Xpp Technologies Ag||Multi-processor with selectively interconnected memory units|
|US20030201794 *||Apr 29, 2003||Oct 30, 2003||Altera Corporation||Programmable logic device with hierarchical interconnection resources|
|US20040100304 *||Oct 6, 2003||May 27, 2004||Kimitaka Kawase||Bidirectional signal transmission circuit|
|US20040108871 *||Aug 27, 2003||Jun 10, 2004||Altera Corporation||Use of dangling partial lines for interfacing in a PLD|
|US20040196066 *||Apr 21, 2004||Oct 7, 2004||Ting Benjamin S.||Architecture and interconnect scheme for programmable logic circuits|
|US20050162933 *||Jan 24, 2005||Jul 28, 2005||Madurawe Raminda U.||Programmable interconnect structures|
|US20060076974 *||Sep 21, 2005||Apr 13, 2006||Ting Benjamin S||Architecture and interconnect scheme for programmable logic circuits|
|US20060202717 *||May 10, 2006||Sep 14, 2006||Ting Benjamin S||Architecture and interconnect scheme for programmable logic circuits|
|US20060267632 *||May 13, 2005||Nov 30, 2006||Schwarz Daniel J||Method and apparatus for buffering bi-directional open drain signal lines|
|US20060290381 *||Jun 23, 2006||Dec 28, 2006||Integrated Electronic Solutions Pty Ltd.||A Bi-Directional Bus Buffer|
|US20070030027 *||Oct 10, 2006||Feb 8, 2007||Madurawe Raminda U||Programmable interconnect structures|
|US20070247188 *||May 25, 2005||Oct 25, 2007||Nec Corporation||Programmable Semiconductor Device|
|US20070290711 *||Jun 15, 2006||Dec 20, 2007||Marak Chadwick N||Bidirectional buffer with slew rate control and method of bidirectionally transmitting signals with slew rate control|
|US20080007300 *||Sep 20, 2007||Jan 10, 2008||Itt Manufacturing Enterprises, Inc.||Method and Apparatus for Buffering Bi-Directional Open Drain Signal Lines|
|US20080007302 *||Jun 15, 2006||Jan 10, 2008||Marak Chadwick N||Apparatus and method that provides active pull-up and logic translation from one signal mode to another signal mode|
|US20080180131 *||Jan 28, 2008||Jul 31, 2008||Steven Teig||Configurable IC with Interconnect Circuits that also Perform Storage Operations|
|US20080231314 *||May 27, 2007||Sep 25, 2008||Steven Teig||Configurable IC Having A Routing Fabric With Storage Elements|
|US20080231315 *||May 27, 2007||Sep 25, 2008||Steven Teig||Configurable IC Having A Routing Fabric With Storage Elements|
|US20090327987 *||Dec 31, 2009||Steven Teig||Timing operations in an IC with configurable circuits|
|US20100039139 *||Feb 18, 2010||Martin Vorbach||Reconfigurable sequencer structure|
|US20100095094 *||Dec 17, 2009||Apr 15, 2010||Martin Vorbach||Method for processing data|
|US20110145547 *||Jun 16, 2011||Martin Vorbach||Reconfigurable elements|
|US20110163781 *||Nov 30, 2010||Jul 7, 2011||Andre Rohe||Method and apparatus for identifying connections between configurable nodes in a configurable integrated circuit|
|US20110202586 *||Aug 18, 2011||Steven Teig||Configurable ic's with dual carry chains|
|USRE44365||Oct 21, 2010||Jul 9, 2013||Martin Vorbach||Method of self-synchronization of configurable elements of a programmable module|
|USRE44383||Apr 24, 2008||Jul 16, 2013||Martin Vorbach||Method of self-synchronization of configurable elements of a programmable module|
|USRE45109||Oct 21, 2010||Sep 2, 2014||Pact Xpp Technologies Ag||Method of self-synchronization of configurable elements of a programmable module|
|USRE45223||Oct 21, 2010||Oct 28, 2014||Pact Xpp Technologies Ag||Method of self-synchronization of configurable elements of a programmable module|
|WO2005125014A1 *||May 25, 2005||Dec 29, 2005||Nec Corporation||Programmable semiconductor device|
|U.S. Classification||326/41, 326/47, 326/39|
|International Classification||H03K19/0185, H03K19/177|
|Cooperative Classification||H03K19/018592, H03K19/17704, H03K19/17736|
|European Classification||H03K19/177F, H03K19/0185R, H03K19/177B|
|Oct 26, 1995||AS||Assignment|
Owner name: XILINX, INC., CALIFORNIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DUONG, KHUE;TRIMBERGER, STEPHEN M.;REEL/FRAME:007738/0192
Effective date: 19951026
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